Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 79 bytes)

Domain getting the following error:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 79 bytes) in /home/username/public_html/libraries/joomla/database/database/mysqli.php on line 498

Solution: 

Step1 : Login to the root

Step 2: Create the info.php file and check the memory limit.

Step 3: If it is 64MB. Then go to php.ini. File and then change it to 256M according to the memory availability.